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	* Megaparsec (mpc) - (Astronomy): Definition
		A megaparsec (Mpc) is a unit of distance that is equal to one million, 3.26 x 106 light-years or 3.085678 x1019 kilometers.
		The of galaxies is roughly a megaparsec in diameter.
		A megaparsec (Mpc) is a unit of distance that is equal to one million parsecs, 3.26 x 106 light-years or 3.085678 x1019 kilometers.
	en.mimi.hu /astronomy/megaparsec_(mpc).html (210 words)

	* Megaparsec - (Astronomy): Definition
		Hubble Constant The present expansion rate of the universe, symbolized by H and measured in units of km/s/Mpc or kilometers per second per megaparsec.
		The exact value of the Hubble constant is still somewhat uncertain, but is generally believed to be around 65 kilometers per second for every megaparsec in distance.
		The standard CDM model that emerged in the mid-1980s served a very useful purpose because it established that the underlying cosmology was a flat Friedmann model with a Hubble constant of 50 kilometres per second per megaparsec,...
	en.mimi.hu /astronomy/megaparsec.html (570 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		The value of Ho itself must be cautiously derived from a sample of galaxies that are far enough away that motions due to local gravitational influences are negligibly small.
		The units of the Hubble Constant are "kilometers per second per megaparsec." In other words, for each megaparsec of distance, the velocity of a distant object appears to increase by some value.
		(A megaparsec is 3.26 million light-years.) For example, if the Hubble Constant was determined to be 50 km/s/Mpc, a galaxy at 10 Mpc, would have a redshift corresponding to a radial velocity of 500 km/s.
	www.whatreallyhappened.com /bang (674 words)

	Biograpgy of Edwin Powell Hubble (1889 - 1953)
		Hubble and his colleague at Mt. Wilson, Milton Humason (who started as a mule driver during the construction of the observatory, then janitor, then night assistant), estimated the expansion rate of the universe to be 500 kilometers per second per megaparsec.
		(A megaparsec, or a million parsecs, is a distance equal to about 3.26 million light-years; so a galaxy two megaparsecs away is receding from us twice as fast as a galaxy only one megaparsec away.) This estimate is called the Hubble Constant, and scientists have been fine-tuning it ever since.
		The Hubble Space Telescope was launched in 1990, one of its major goals being to pin down the Hubble Constant.
	hubble.nasa.gov /overview/hubble_bio.php (780 words)

	Encyclopedia: Megaparsec (Site not responding. Last check: 2007-10-19)
		FACTOID # 22: The top nations for per capita imports and exports tend to be very small.
		The parsec (symbol pc) is a unit of length used in astronomy.
		Category: Astronomical units of length September 7 is the 250th day of the year (251st in leap years).
	www.nationmaster.com /encyclopedia/Megaparsec (455 words)

	Hubble law and the expanding universe
		Much of the evidence about quasars is based on the Hubble law, with Hubble constant in the range 40-110 km/sec per megaparsec.
		The value from the WMAP survey is 71 km/s per megaparsec.
		The Hubble Law states that the distance to a given galaxy is proportional to the recessional velocity as measured by the Doppler red shift.
	hyperphysics.phy-astr.gsu.edu /hbase/astro/hubble.html (578 words)

	[No title]
		Efforts to establish the Hubble constant have not resulted in universal agreement, and thus cosmologists have been assigning the universe a broad age range between 8 and 20 billion years (meaning that the visible universe spans between 16 and 40 billion light-years across).
		A parsec is the distance of an object from earth when the object varies one second of an arc when viewed on opposite sides of the earth’s orbit (that is, viewing the object at times six months apart).
		The parsec (meaning parallax of one second) equals about 3.26 light-years; a megaparsec is a million times this amount.
	www.unityinchrist.com /preevangelism/howbigistheuniverse.htm (764 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		The 75 (km/sec)/ Megaparsec value is assumed close enough to begin the calculations.
		A photon loses 0.00025 of its momentum to wavelength, by passing through a megaparsec of space, and loses 0.00025 of its energy to wavetime in the same distance.
		Measuring the red shift at a point halfway between Earth and quasar 2C73 would yield a red shift half of that which is observed on Earth.
	members.chello.nl /~n.benschop/adapting.htm (577 words)

	Chandra :: Resources :: Q&A: Cosmology
		You are probably referring to the recent determinations of that the Hubble constant, which gives the rate of expansion of the universe, is 65.
		However, the units are not miles per hour, but kilometers per second per megaparsec.
		A megaparsec is a unit of distance equal to 3.26 million light years.
	chandra.harvard.edu /resources/faq/cosmology/cosmology-2.html (142 words)

	Page Title (Site not responding. Last check: 2007-10-19)
		Mathematically, the Hubble constant is: Ho = V/d, where V is the velocity of the body away from us, and d is its distance from us.
		A megaparsec is about 3.26 million light years, and a light year is the distance light travels in a year at the speed of 186,000 miles per second, or about 19 trillion miles.
		This means that for every megaparsec a galaxy is further from us, it's speed away from us increases by about 525 km/sec.
	www.ubfellowship.org /archive/newsletters/innerface/vol8_3/page11.html (877 words)

	Japan Forum - View Single Post - Universe How Big ?
		RADIUS: ~10,000 Megaparsec or 3 × 10^26 metres
		This value is uncertain both because the value of isn't precisely known, and also because the value of H0 isn't precisely known either.
		The radius of the observable Universe is about 10,000 Megaparsec (or about 3 × 1026 metres).
	www.jref.com /forum/showpost.php?p=177263&postcount=1 (671 words)

	Hubble's Law (Site not responding. Last check: 2007-10-19)
		This means that a galaxy 1 megaparsec away will be moving away from us at a speed of 75 km/sec, while another galaxy 100 megaparsecs away will be receding at 100 times this speed.
		If all the lengths in the universe double in 10 million years then something that was initially 1 megaparsec away from us will end up a further megaparsec away.
		Something that was 2 megaparsecs away from us will end up a further 2 megaparsecs away.
	www.ipac.caltech.edu /wire/beginners/hubble.html (293 words)

	ARVAL-STScI - The Hubble Constant (Site not responding. Last check: 2007-10-19)
		The units of the Hubble Constant are "kilometers per second per megaparsec".
		In other words, for each megaparsec of distance, the velocity of a distant object appears to increase by some value.
		For example, if the Hubble Constant were determined to be 50 km/s/Mpc, a galaxy at 10 Mpc would have a red shift corresponding to a radial velocity of 500 km/s.
	www.oarval.org /hnought.htm (423 words)

	Hubble constant concept from the Astronomy knowledge base
		has definition The present expansion rate of the universe, in units of kilometers per second per megaparsec.
		The Hubble constant is generally used to mean the value of the Hubble parameter at the current epoch, and is somewhere between 50 and 100 km/s/Mpc with possibly a value close to 75 km/s/Mpc.
		has definition The rate at which the universe expands, equal to approximately fifty kilometers of velocity per megaparsec of distance.
	www.csi.uottawa.ca:4321 /astronomy/Hubbleconstant.html (353 words)

	ASTRONOMY 348: Homework 7 (Site not responding. Last check: 2007-10-19)
		A Hubble constant of 50 kilometers per second per Megaparsec corresponds to about 20 billion years for a Hubble time.
		Assume that the Hubble constant is 50 kilometers per second per Megaparsec.
		Using the Hubble law and the nonrelativistic redshift formula, z=v/c where $z$ is the redshift, calculate how far away a galaxy is if it has a redshift of one percent.
	www.astro.virginia.edu /~jh8h/astr348/homework7.html (146 words)

	The Large-scale Distribution of Galaxies
		Each panel is a slice 170 megaparsecs on a side and 16 megaparsecs thick.
		These physically-motivated ``recipes'' describe the cooling and condensation of gas at the centres of dense regions of dark matter, the transformation of this gas into stars, the effect of supernova explosions on the intergalactic medium, and the merging of close pairs of galaxies.
		Figure 2 shows the evolution of a region 42 megaparsecs on a side taken from the simulation shown in Figure 1.
	www.mpa-garching.mpg.de /HIGHLIGHT/1999/highlight9903_e.html (643 words)

	The Hubble Constant (Site not responding. Last check: 2007-10-19)
		This means that for every megaparsec the velocity of some object seems to increase by some amount of velocity.
		Edwin Hubble originally predicted the constant to be around 500 kilometers per second per megaparsec and since then scientists have placed the constant at anywhere between 100 and 50 kilometers per second per megaparsec.
		This difference for the value of the Hubble constant provided a huge discrepancy for the age of the universe- somewhere between 10 and 20 billion years old.
	www.cas.muohio.edu /~alexansg/phy111/GROUPS/group21/hubble.html (1788 words)

	Astronomical Distances (Site not responding. Last check: 2007-10-19)
		When the star's change in angle is one arc second, or.000278 degrees, the distance to the star is defined as a parsec.
		A megaparsec is a million parsecs, or 10
		An astronomical unit is the average distance of the earth from the sun.
	astrosun2.astro.cornell.edu /academics/courses/astro201/galaxies/dist.htm (240 words)

	pressrelease
		Parsec is used as a unit of distance as stars are then a few parsecs away and galaxies a few megaparsecs away (one megaparsec = 3.086exp(22) metres).
		A value of the Hubble constant that is often cited is that of Riess, Press and Kirshner (1996) who found it to have the value 64 km/s per Mpc.
		To put it simply, (and ignoring local gravitational effects) a galaxy one megaparsec away will recede at a speed of 64 km/s, a galaxy 2 megaparsec away will recede at a rate of 128 km/s and so on.
	www.lyndonashmore.com /pressrelease.html (1041 words)

	The Hubble Expansion (Site not responding. Last check: 2007-10-19)
		The exact value of the Hubble constant is somewhat uncertain, but is generally believed to be around 70 kilometers per second for every megaparsec in distance, km/sec/Mpc.
		This means that a galaxy 1 megaparsec away will be moving away from us at a speed of about 70 km/sec, while another galaxy 100 megaparsecs away will be receding at 100 times this speed.
		This model also explains the linearity of the Hubble law, by which we mean the fact that the recession velocity is proportional to distance.
	astron.berkeley.edu /~mwhite/darkmatter/hubble.html (582 words)

	Archive (HÃ¥vard's web site)
		A parsec is an astronomical unit, and it's approximately equal to 3.26 light years.
		A megaparsec, then, is 3 260 000 light years.
		To put this in perspective, our galaxy's diameter is roughly 100 000 light years, which is about 3% of a megaparsec.
	havard.no-ip.info /archive/2005/10/25 (337 words)

	cosmology lecture 2
		For a galaxy a distance d away from us and receding at a speed v it is observed that
		That is, for every megaparsec the speed of recession increases by about 65 km/s.
		Consequently, every galaxy must have arrived at its present location, relative to us, sooner than the Hubble time, which is the age we inferred by assuming the recession speed never changed.
	www.stormpages.com /swadhwa/cosmology/coslec2.html (927 words)

	Megaparsec (Site not responding. Last check: 2007-10-19)
		The word "megaparsec" uses 10 letters: A A C E E G M P R S.
		Words within megaparsec not shown as it has more than seven letters.
		All words formed from megaparsec by changing one letter
	www.morewords.com /word/megaparsec (182 words)

	[No title]
		In another result also being presented today in Sardinia, several other members of the Telescope Institute are presenting data which suggest the rate of expansion of the universe -- the Hubble Constant -- is between 40 and 60 kilometers a second for a megaparsec of volume.
		(A megaparsec is equivalent to 3.26 million light years.) This new finding narrows significantly the range of possibilities for the Hubble Constant, previously thought to be between 50 and 100 kilometers/second/megaparsec.
		The definition of the Hubble Constant is one of the principal reasons for developing and launching the Hubble Telescope and bears significantly on which cosmological theory is correct.
	science.ksc.nasa.gov /shuttle/missions/news/1992/h06.29.92 (1300 words)

	Bathsheba Grossman - Large Scale (Site not responding. Last check: 2007-10-19)
		The cosmological model for this piece is tuned to match the Sloan Survey, an investigation of all galaxies we can see in one quadrant of the sky.
		It takes us out to within 1000 megaparsecs of Earth.
		The survey isn't finished yet, so you are looking at current research.
	www.bathsheba.com /crystalsci/largescale (317 words)

	MSN Encarta - Search Results - megaparsec
		Hubble identified the relationship between velocity and distance in 1929, but the numeric value of Hubble’s constant is still uncertain.
		The value of Hubble’s constant probably falls between 64 and 78 kilometers per second per megaparsec (between 40 and 48 miles per second per...
		Exclusively for MSN Encarta Premium Subscribers--quickly search thousands of articles from magazines such as Time, Newsweek, The Atlantic Monthly, and Smithsonian.
	encarta.msn.com /megaparsec.html (82 words)

	The devil is in the distance
		An accurate value for the Hubble constant would be a guide to understanding the history and fate of the Universe in which we live.
		Over the past few years, estimates for the Hubble constant have varied between 60 and 75 kilometres per second per megaparsec (where a megaparsec is a unit of distance equivalent to roughly three million light years).
		The estimate, around 7.2 megaparsecs, remains the most accurate and reliable measurement of the distance to any other extragalactic object – but it is 12% out from the Cepheid-based measurement to the very same galaxy.
	www.mindswap.org /2002/nature/990923-13.xml (687 words)

	Nat' Academies Press, Cosmology: A Research Briefing (1995)
		An accurate measurementof H0 is crucial for assessing whether the detailed models of theevolution of structure in the universe can be reconciled with a widerange of observations.
		range between 45 km/s per megaparsec (a megaparsec is about 3 millionlight-years) and 90 km/s per megaparsec.
		A fundamentalreality check comes from requiring the oldest stars in our galaxyto be younger than the age of the universe.
	www.nap.edu /openbook/NX005722/html/22.html (802 words)

	Space Today Online - Answers To Your Questions
		The units of the Hubble constant are “kilometers per second, per Megaparsec.” A Megaparsec (Mpc) is 3.26 million light-years.
		For each Megaparsec of distance, the velocity of a distant object appears to increase by some value.
		Astronomers in the 21st century believe the number is somewhere between 46 and 57 miles per second per megaparsec (57 and 73 kilometers per second per megaparsec).
	www.spacetoday.org /Questions/HubbleConstant.html (1035 words)

	[No title]
		For each galaxy the table lists the speed at which the galaxy is moving away from us and its distance in Megaparsecs (each Megaparsec is equal to 3.25 million LY).
		Make a dot for each cluster, where the horizontal position is determined by the velocity and the vertical position is determined by the distance.
		Estimate the recession velocity for a cluster at a distance of 1000 Megaparsecs (1000 Mpc is equal to 3,260,000,000 or 3.26 BILLION light years).
	www.astro.indiana.edu /catyp/activities/hubble.doc (572 words)

	SPACE.com -- Universe Might be Bigger and Older than Expected
		The finding, which will be detailed in an upcoming issue of Astrophysical Journal, suggests that the Hubble constant, a number that measures the expansion rate and age of the universe, is actually 15 percent smaller than other studies have found.
		Currently, most astronomers agree that the value of the Hubble constant is about 71 kilometers per second per megaparsec (a megaparsec is 3.2 million light-years).
		If this value were smaller by 15 percent, then the universe would be older and bigger by this amount as well.
	www.space.com /scienceastronomy/060807_mm_huble_revise.html (601 words)

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